Analysis of spherical indentation of porous ceramic films
Analysis of spherical indentation of porous ceramic films
复制标题
DOI：
10.1016/j.jeurceramsoc.2016.10.002
复制
发表时间：
2017-03
影响因子：
5.7
通讯作者：
Zhangwei Chen;Xin Wang;N. Brandon;A. Atkinson
中科院分区：
文献类型：
--
作者：
Zhangwei Chen;Xin Wang;N. Brandon;A. Atkinson
采用Gurson模型对弹性体Ce0.9Gd0.1O1.95衬底上的多孔脆性La0.6Sr0.4Co0.2Fe0.8O3陶瓷薄膜（孔隙率为39.7%）的球形压痕进行了有限元模拟。模拟得到的载荷-位移曲线、表观弹性模量E、压痕硬度和致密化曲线与实验结果吻合较好。模拟结果表明，E和H对薄膜残余应力不敏感. E对膜厚比f非常敏感，但对f < 0.3的膜厚比H较不敏感。EandH的模拟依赖性与实验数据高度一致，支持0.1 <f< 0.3时测量的EandH外推到零深度，以获得对膜单独性质的良好估计。在模拟中包括致密化只使一个很小的差异E，但有很大的影响有一个函数的压痕深度。
Spherical indentation of a porous brittle La0.6Sr0.4Co0.2Fe0.8O3ceramic film (porosity = 39.7%) on a stiffer elastic Ce0.9Gd0.1O1.95substrate is simulated by finite element modelling incorporating the Gurson model to account for densification. The simulated load-displacement curves, apparent elastic modulusE, indentation hardnessHand densification profile are all in good agreement with experimental data for the film. The simulations show thatEandHare not sensitive to film residual stress. HoweverEis very sensitive to the indent depth-film thickness ratiof, althoughHis less so forf< 0.3. The simulated dependence ofEandHonfare highly consistent with experimental data, supporting the extrapolation ofEandHmeasured for 0.1 <f< 0.3, to zero depth for good estimates of the film-alone properties. The inclusion of densification in the simulation makes only a small difference toE, but has a large influence onHas a function of indentation depth.